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Hazard ratios for types of retainers and for gender.
| Upper arch | Lower arch | |||||||
|---|---|---|---|---|---|---|---|---|
| Hazard ratio | P | 95% confidence interval | Hazard ratio | P | 95% confidence interval | |||
| Conventional to CAD/CAM | 0.99 | 0.99 | 0.52 | 1.90 | 0.93 | 0.80 | 0.53 | 1.63 |
| Male to female | 1.31 | 0.43 | 0.66 | 2.57 | 0.73 | 0.28 | 0.41 | 1.30 |
